I like "what comes around, goes around" and "do unto others as they would have done unto you" (that doesn't sound right though). Also, "A wise person speaks because he has something to say. A fool speaks because he has to say something." - I'm sure I'm guilty of this myself. What's your favorite saying?
my favorite saying used to be "for real" i used to respond to everything that way, havent caught myself doing it lately
"Better to keep your mouth shut and appear a fool, than to open it and remove all doubt." - Abraham Lincoln, I think. (Advice that I rarely follow...) "Ah, but a man's reach should exceed his grasp. Or what's a heaven for?" Robert Browning